Jackass prankster Bam Margera has been hospitalised after falling down a flight of stairs while "horsing around".
The TV stuntman had challenged his neighbour to a race and Margera promised to give his pal one of his prized skateboards if he won - but the star slipped and ended up in a pile at the bottom of the stairs.
He tells Tmz.com, "Somehow I wound up tumbling down the stairs. I tackled my neighbor and fell down the stairs horsing around. I’m still in the hospital."
Margera has yet to learn the extent of his injuries, but he believes he's suffered a broken arm and several cracked ribs.